On Wed, Mar 01, 2017 at 04:30:26PM +0200, Noa Osherovich wrote: > Analysis: > Since ib_comp_wq isn't single threaded, two works can run in parallel for the > same CQ, > executing __ib_process_cq.
They shouldn't. Each CQ has a single work_struct, and any given work_struct should only be executing at once: "Note that the flag ``WQ_NON_REENTRANT`` no longer exists as all workqueues are now non-reentrant - any work item is guaranteed to be executed by at most one worker system-wide at any given time." > Since this function isn't thread safe and the wc array is shared, it causes a > data corruption > which eventually crashes in the MAD layer due to a double list_del of the > same element. This should not be the case. What kernel version are you testing and does it contain any patches touching core kernel code?
